Williams-Beuren Syndrome and Epilepsy: A Retrospective Analysis of 589 Patients.

Although many reports have described the characteristics of Williams-Beuren syndrome, few specifically analyzed epilepsy in patients with Williams-Beuren syndrome. In this retrospective study, we map the prevalence, types, and prognosis of epileptic seizures in a large cohort of 589 patients with Williams-Beuren syndrome, as well as associations between deletions of the membrane-associated guanylate kinase inverted-2-gene (MAGI2 gene), which is associated with infantile spasms (IS), and epilepsy in patients with Williams-Beuren syndrome.Our findings indicate that the incidence of epilepsy in patients with Williams-Beuren syndrome is approximately 1.02% (6 in 589), and is thus not higher than the incidence in the general population (0.5%-1.0%). West syndrome emerged as the most common epileptic syndrome in patients with Williams-Beuren syndrome (4 of 6) and typically has a favorable prognosis. There was no genotype-phenotype correlation between MAGI2 deletions and West syndrome in this cohort.